segmentation fault in fs_list_get_path

[Timo Sirainen]

On 3 Aug 2019, at 21.22, David M. Johnson via dovecot <dovecot at dovecot.org> wrote:
> 
> There seems to be a straightforward bug in src/lib-storage/list/mailbox-list-fs.c:79.  set->index_dir is unchecked prior to dereferencing (unlike on line 126 in the same file, where it is properly checked).  This manifested on a FreeBSD server running dovecot 2.3.6 when clients tried to retrieve mail with subscriptions like `~/bar/baz`.  This caused the `imap` child to crash, e.g. (slightly anonymized)

Could you also send your doveconf -n output? Would likely help creating a reproducible test.